/Engine/Source/Runtime/MovieScene/Public/EntitySystem/MovieSceneEntitySystemTypes.h
A numeric identifier used to represent a specific 'channel' within an interrogation linker. Interrogation channels are used to identify groupings of tracks or entities that relate to the same output (eg: a property on an object; a root track etc). SeeFInterrogationKeyfor a combination of a channel with a specific interrogation index (or time)
struct FInterrogationChannel